Depth-gage for brace-bits.



No. 803,939. 1 PATENTBD NOV. '7, 1905. E. J. TIEDE. DEPTH GAGE FOR BRACBBITS.

APPLICATION FILED JUNE 23, 1906.

INVENTOR Edward JZE'ecZe WITNESSES.

ATTURN EDWVARD JOHN TIEDE, OF BUFFALO, NEW YORK.

DEPTH-GAGE FOR BRACE-BITS.

Specification of Letters Patent.

Patented Nov. 7, 1905.

Application filed June 23,1905. Serial No. 266,572.

T at whom, it may concern:

Be it known that I, EDWARD J OHN TIEDE, a citizen of the United States,and a residentof Buffalo, in the county of Erie and State of New York,have invented a new and Improved Depth-Gage for Brace-Bits, of which thefollowing is a full, clear, and exact description.

The object of this invention is to provide a novel simple attachment forthe boring-bit of a hand-operated brace which is very compact,inexpensive, is readily placed upon and removed from the shanks ofboring-bits of different diameters, is longitudinally adjustable thereonfor accurately gaging the depth the bit is to bore, and that may berapidly produced by ordinary tools and methods of manufacture in anyquantity desired.

The invention consists in the novel construction and combination ofparts, as is hereinafter described, and defined in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side view in part of a handbrace for woodworkers use, aboring-bit in the chuck of the brace, and the improved adjustable gagemounted upon the shank of the bit. Fig. 2 is an enlarged detached planview of the depth-gage; and Fig. 8 is a side view of the same seen indirection of the arrow in Fig. 2.

In the drawings, 5 represents the normally lower portion of awoodworkers hand-brace, having the usual bit-holding chuck 5 secured onthe lower end of the body thereof. The bit 6 is of the auger variety,the shank 6 of which is detachably secured on the lower end of the brace5 by its central engagement within the chuck 5, whereby the bit is heldaxially alined with the chuck and head of the brace (not shown) forrotation by the sleeve-like handle 5 as usual.

The improved depth-gage comprises the following details: The mainportion of the device consists of a clamp formed of two sections 7 7that together engage the shank 6 of the boring-bit and are secureddetachably thereupon, as best shown in Fig. 2. The clampsection 7 isformed of a metal block, preferably having parallel and flat top andbottom faces, with the exception that two angularly bent or formed jaws(ta project oppositely from each other at one end of said section,wherein a V-shaped notch is cut, the sides of which aline with thecorresponding faces of the jaws. The other clamp-seotion 7*is shorterthan the section 7 and is essentially rectangular on three sides, theremaining side having a rectangular notch b therein, forming two limbs bthereon. The clamp-sections7 7 have equal width and thickness, and onelimb b of the block 7 produced by the notch b, is formed with ahinge-leaf that projects centrally from its end and is introduced andpivoted at b between two spaced leaves on the corresponding end of theclamp-section 7, thus adapting the clamp-section 7 to rock laterally andopen the passage formed between said clamp-sections by the notches inthe adjacent ends thereof. A spring latch-plate 8, consisting of aresilient metal strip, is secured by rivets 0 on the side of the section7 opposite the hinge-joint b and the portion of said latchplate whichlaps upon the clamp-section 7 is bent outward at its free end to affordmeans for its manipulation. Said lapped portion also is perforated at asuitable point for a latching engagement with a stud 0, projecting fromthe clamp-section 7, said latch-plate when so engaged holding theclamp-sections closed.

Preferably at the center of the notch 6 the body of the clamp-section 7is longitudinally perforated and internally threaded for the receptionof a set-screw 9, which is adapted to engage at its inner end with theshank 6 of the auger-bit when the shank is placed in the opening betweenthe clamp-sections and the sections are swung together, so that thelatchplate is locked upon the stud c. It will be seen that the pressureof the screw 9 will force the shank 6 into close contact with the jaws aa and secure the two-part body of the clamp 7 7 extended laterally fromthe bitshank 6 at right angles therewith, this engagement of the clampand bit-shank being clearly shown in Fig. 2.

Near the outer end and transverse center of the clamp-section 7 avertical perforation is formed therein, and in said perforation isslidably inserted the upper portion of a gagebar 10, which may be acylindrical metal rod of a suitable length for effective service, andsaid rod is preferably graduated to enable a proper adjustment of thesame to be made. On the lower end of the gage-rod a foot 10 is formedwhich extends laterally from the body thereof and may be curved edgewisesomewhat for a projection of the outer end of the foot toward the spiralbody of the augerbit 6 when in use or as shown in Fig. 1. A horizontalthreaded perforation is formed in the clamp-section 7 at the same sideas the hinge-joint b and receives therein a set-screw 11, which at itsinner end bears upon the gagerod 10.

In use the gage-rod may be set at a desired point which may be indicatedby the scale on the gage-rod, and this will raise the foot 10 a properdistance above the point of the bit 6 after the clamping-sections 7 7 ahave been secured on the bit-shank 6 at a selected point.

It will be seen that any desired number of perforations of an equaldepth may be formed in material, the depth being indicated by a contactof the foot 10 upon the material wherein the holes are bored. Obviously,by a change in adjustment of the gage-rod holes of differentpredetermined depths may be formed with exact precision.

An advantageous feature consists in the means for quickly detaching thedepth-gage from a bit-shank without requiring the removal of the latterfrom the chuck on the brace, as this can be readily effected byreleasing the set-screw from pressure on the bit-shank and thenunlatching the latch-plate 8, which will permit the clamping-sections 77 to be swung apart and removed from the bit-shank.

It is apparent that the improved depth-gage is extremely simple, is veryreliable, and is adapted for general use where perforations of certaindepth are required.

Havingthus described my invention. 1 claim as new and desire to secureby Letters Patent- 1. Adepth-gage,comprisingaclamp formed of twosections, one section having a rectangular notch in one end forming twoparallel members and a threaded opening leading into the notch, and theother section having a \!-shaped notch in one end, a vertical opening inits other end, and a threaded opening leading into the vertical opening,the last-named section being hinged to one of the members of thefirst-named section by a vertical pivot, a spring latch-plate secured atone end to the side of one of the clamp-sections and provided with anopening in its free end to receive a lateral projecting pin on the othersection, a set-screw in the threaded opening of the section having therectangular notch and adapted to engage the shank of the bit when thesections are latched together, a graduated gage-bar in the verticalopening of the section with the \l-shaped notch, and having a foot atits lower end, and a set-screw in the threaded opening of saidclamp-section and engaging the said gage-bar, substantially as hereinshown and described.

2. A depth-gage, comprising a two-part clamping-block, one part having aV-shaped notch in one end, \I-shaped jaws projecting from the upper andlower sides of said part, the sides of said jaws alining with walls ofthe V-shaped notch, a-hinge-joint between the block-sections at one sidethereof, the other section of the clamping-block having a recess in acorresponding end, a spring latch-plate secured by one end on the sideof one section of the clamping-block and having a perforation in itstree portion adapted to receive a locking projection on a correspondingside of the other clamping-section, a set-screw adjustable in the end ofthe section for pressure on a bit-shank when the block-sections arelatched together, a gage-bar vertically slidable in a perforation in theblock-section having the \I-shaped notch therein, and a setscrew workingin the side of said block-section adapted for holding the gage-bar at adesired point of adjustment.

In testimony whereofl have signed my name to this specification in thepresence of two subscribing witnesses.

EDWVARD JOHN TIEDE.

Witnesses:

GEORGE Homv, MICHAEL STEGER.

